Old thread This problem, absent for a while, has now returned. I believe it was after a new LU patch.
Scans start but the icon/dialog box never leaves the screen until I use Applications->Utilities->Application Monitor and force quit symUIAgent.app.
Doesn't make any difference if it's an internal or external drive, a downloaded file... the scanning icon pops up - and though I can sometimes pause the scan, I can't cancel or dismiss the window. Even starting a single 860KB file scan manually causes this behavior, the barber pole just spins (though from here I can cancel and dismiss the UI window).
What's up with this?
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